Round: 62 Ground: Hardcourt outdoor
| ITF Japan F1 | 2016/03/06 03:00 | Watanuki, Keisuke v Sora Fukuda | 6-1,3-6,6-3 |
| ITF Japan F1 | 2016/03/05 03:00 | Watanuki, Keisuke v Yuichiro Inui | 6-2,6-3 |
| ITF Japan F8 | 2015/06/25 01:00 | Numajiri, Keisuke v Watanuki, Keisuke | 3-6,3-6 |
| ITF Japan F8 | 2015/06/24 02:45 | Watanuki, Keisuke v Ito, Yuichi | 6-1,7-5 |
| ITF Japan F7 | 2015/06/16 02:15 | Onozawa, Arata v Watanuki, Keisuke | 7-6,0-6,6-3 |
| ITF Japan F6 | 2015/06/11 02:55 | Niki, Takuto v Watanuki, Keisuke | 6-7,7-6,6-4 |
| ITF Japan F6 | 2015/06/10 01:30 | Watanuki, Keisuke v Oku, Hiromasa | 6-2,6-3 |
| ITF Japan F5 | 2015/06/04 02:00 | Thomas Fancutt v Watanuki, Keisuke | 7-5,7-6 |
| ITF Japan F1 | 2016/03/06 03:00 | Kazuma Kawachi v Ren Nakamura | 3-6,6-4,6-2 |
| ITF Japan F1 | 2016/03/05 03:00 | Kai, Naoto v Kazuma Kawachi | 6-4,3-6,4-6 |
| ITF Thailand F9 | 2015/12/02 07:35 | Navasirisomboon, Jirat v Kazuma Kawachi | 6-4,6-7,6-2 |
| ITF Thailand F9 | 2015/11/29 05:50 | Kazuma Kawachi v Klaoklang, Marut | 6-2,6-1 |
| ITF Thailand F9 | 2015/11/28 06:30 | Kazuma Kawachi v Heyer, Gianandrea | 6-2,6-1 |
| ITF Thailand F9 | 2015/11/24 07:30 | Blake Mott v Kazuma Kawachi | 6-3,6-2 |
| ITF Chinese Taipei F1 | 2015/08/24 04:55 | Kazuma Kawachi v Hadavi, Shawn H | 4-6,0-6 |
| ITF Chinese Taipei F1 Qual | 2015/08/17 06:30 | Lin, Hsin v Kazuma Kawachi | 6-0,6-0 |